Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Kernel-based Virtual Machine driver for Linux |
| 3 | * |
| 4 | * This module enables machines with Intel VT-x extensions to run virtual |
| 5 | * machines without emulation or binary translation. |
| 6 | * |
| 7 | * MMU support |
| 8 | * |
| 9 | * Copyright (C) 2006 Qumranet, Inc. |
| 10 | * |
| 11 | * Authors: |
| 12 | * Yaniv Kamay <yaniv@qumranet.com> |
| 13 | * Avi Kivity <avi@qumranet.com> |
| 14 | * |
| 15 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 16 | * the COPYING file in the top-level directory. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * We need the mmu code to access both 32-bit and 64-bit guest ptes, |
| 22 | * so the code in this file is compiled twice, once per pte size. |
| 23 | */ |
| 24 | |
| 25 | #if PTTYPE == 64 |
| 26 | #define pt_element_t u64 |
| 27 | #define guest_walker guest_walker64 |
| 28 | #define FNAME(name) paging##64_##name |
| 29 | #define PT_BASE_ADDR_MASK PT64_BASE_ADDR_MASK |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 30 | #define PT_LVL_ADDR_MASK(lvl) PT64_LVL_ADDR_MASK(lvl) |
| 31 | #define PT_LVL_OFFSET_MASK(lvl) PT64_LVL_OFFSET_MASK(lvl) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 32 | #define PT_INDEX(addr, level) PT64_INDEX(addr, level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 33 | #define PT_LEVEL_MASK(level) PT64_LEVEL_MASK(level) |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 34 | #define PT_LEVEL_BITS PT64_LEVEL_BITS |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 35 | #ifdef CONFIG_X86_64 |
| 36 | #define PT_MAX_FULL_LEVELS 4 |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 37 | #define CMPXCHG cmpxchg |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 38 | #else |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 39 | #define CMPXCHG cmpxchg64 |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 40 | #define PT_MAX_FULL_LEVELS 2 |
| 41 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 42 | #elif PTTYPE == 32 |
| 43 | #define pt_element_t u32 |
| 44 | #define guest_walker guest_walker32 |
| 45 | #define FNAME(name) paging##32_##name |
| 46 | #define PT_BASE_ADDR_MASK PT32_BASE_ADDR_MASK |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 47 | #define PT_LVL_ADDR_MASK(lvl) PT32_LVL_ADDR_MASK(lvl) |
| 48 | #define PT_LVL_OFFSET_MASK(lvl) PT32_LVL_OFFSET_MASK(lvl) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 49 | #define PT_INDEX(addr, level) PT32_INDEX(addr, level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 50 | #define PT_LEVEL_MASK(level) PT32_LEVEL_MASK(level) |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 51 | #define PT_LEVEL_BITS PT32_LEVEL_BITS |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 52 | #define PT_MAX_FULL_LEVELS 2 |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 53 | #define CMPXCHG cmpxchg |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 54 | #else |
| 55 | #error Invalid PTTYPE value |
| 56 | #endif |
| 57 | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 58 | #define gpte_to_gfn_lvl FNAME(gpte_to_gfn_lvl) |
| 59 | #define gpte_to_gfn(pte) gpte_to_gfn_lvl((pte), PT_PAGE_TABLE_LEVEL) |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 60 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 61 | /* |
| 62 | * The guest_walker structure emulates the behavior of the hardware page |
| 63 | * table walker. |
| 64 | */ |
| 65 | struct guest_walker { |
| 66 | int level; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 67 | gfn_t table_gfn[PT_MAX_FULL_LEVELS]; |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 68 | pt_element_t ptes[PT_MAX_FULL_LEVELS]; |
| 69 | gpa_t pte_gpa[PT_MAX_FULL_LEVELS]; |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 70 | unsigned pt_access; |
| 71 | unsigned pte_access; |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 72 | gfn_t gfn; |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 73 | u32 error_code; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 74 | }; |
| 75 | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 76 | static gfn_t gpte_to_gfn_lvl(pt_element_t gpte, int lvl) |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 77 | { |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 78 | return (gpte & PT_LVL_ADDR_MASK(lvl)) >> PAGE_SHIFT; |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 79 | } |
| 80 | |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 81 | static bool FNAME(cmpxchg_gpte)(struct kvm *kvm, |
| 82 | gfn_t table_gfn, unsigned index, |
| 83 | pt_element_t orig_pte, pt_element_t new_pte) |
| 84 | { |
| 85 | pt_element_t ret; |
| 86 | pt_element_t *table; |
| 87 | struct page *page; |
| 88 | |
| 89 | page = gfn_to_page(kvm, table_gfn); |
Izik Eidus | 72dc67a | 2008-02-10 18:04:15 +0200 | [diff] [blame] | 90 | |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 91 | table = kmap_atomic(page, KM_USER0); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 92 | ret = CMPXCHG(&table[index], orig_pte, new_pte); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 93 | kunmap_atomic(table, KM_USER0); |
| 94 | |
| 95 | kvm_release_page_dirty(page); |
| 96 | |
| 97 | return (ret != orig_pte); |
| 98 | } |
| 99 | |
Avi Kivity | bedbe4e | 2007-12-09 16:52:56 +0200 | [diff] [blame] | 100 | static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte) |
| 101 | { |
| 102 | unsigned access; |
| 103 | |
| 104 | access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK; |
| 105 | #if PTTYPE == 64 |
| 106 | if (is_nx(vcpu)) |
| 107 | access &= ~(gpte >> PT64_NX_SHIFT); |
| 108 | #endif |
| 109 | return access; |
| 110 | } |
| 111 | |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 112 | /* |
| 113 | * Fetch a guest pte for a guest virtual address |
| 114 | */ |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 115 | static int FNAME(walk_addr)(struct guest_walker *walker, |
| 116 | struct kvm_vcpu *vcpu, gva_t addr, |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 117 | int write_fault, int user_fault, int fetch_fault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 118 | { |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 119 | pt_element_t pte; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 120 | gfn_t table_gfn; |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 121 | unsigned index, pt_access, pte_access; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 122 | gpa_t pte_gpa; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 123 | int rsvd_fault = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 124 | |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 125 | trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault, |
| 126 | fetch_fault); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 127 | walk: |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 128 | walker->level = vcpu->arch.mmu.root_level; |
| 129 | pte = vcpu->arch.cr3; |
Avi Kivity | 1b0973b | 2007-01-05 16:36:41 -0800 | [diff] [blame] | 130 | #if PTTYPE == 64 |
| 131 | if (!is_long_mode(vcpu)) { |
Avi Kivity | 6de4f3a | 2009-05-31 22:58:47 +0300 | [diff] [blame] | 132 | pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3); |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 133 | trace_kvm_mmu_paging_element(pte, walker->level); |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 134 | if (!is_present_gpte(pte)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 135 | goto not_present; |
Avi Kivity | 1b0973b | 2007-01-05 16:36:41 -0800 | [diff] [blame] | 136 | --walker->level; |
| 137 | } |
| 138 | #endif |
Avi Kivity | a9058ec | 2006-12-29 16:49:37 -0800 | [diff] [blame] | 139 | ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) || |
Marcelo Tosatti | 24993d5 | 2008-02-14 21:25:39 -0200 | [diff] [blame] | 140 | (vcpu->arch.cr3 & CR3_NONPAE_RESERVED_BITS) == 0); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 141 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 142 | pt_access = ACC_ALL; |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 143 | |
| 144 | for (;;) { |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 145 | index = PT_INDEX(addr, walker->level); |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 146 | |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 147 | table_gfn = gpte_to_gfn(pte); |
Avi Kivity | 1755fbc | 2007-11-21 14:44:45 +0200 | [diff] [blame] | 148 | pte_gpa = gfn_to_gpa(table_gfn); |
Izik Eidus | ec8d4ea | 2007-11-19 11:28:19 +0200 | [diff] [blame] | 149 | pte_gpa += index * sizeof(pt_element_t); |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 150 | walker->table_gfn[walker->level - 1] = table_gfn; |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 151 | walker->pte_gpa[walker->level - 1] = pte_gpa; |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 152 | |
Izik Eidus | ec8d4ea | 2007-11-19 11:28:19 +0200 | [diff] [blame] | 153 | kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte)); |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 154 | trace_kvm_mmu_paging_element(pte, walker->level); |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 155 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 156 | if (!is_present_gpte(pte)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 157 | goto not_present; |
| 158 | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 159 | rsvd_fault = is_rsvd_bits_set(vcpu, pte, walker->level); |
| 160 | if (rsvd_fault) |
| 161 | goto access_error; |
| 162 | |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 163 | if (write_fault && !is_writeble_pte(pte)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 164 | if (user_fault || is_write_protection(vcpu)) |
| 165 | goto access_error; |
| 166 | |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 167 | if (user_fault && !(pte & PT_USER_MASK)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 168 | goto access_error; |
| 169 | |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 170 | #if PTTYPE == 64 |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 171 | if (fetch_fault && is_nx(vcpu) && (pte & PT64_NX_MASK)) |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 172 | goto access_error; |
| 173 | #endif |
| 174 | |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 175 | if (!(pte & PT_ACCESSED_MASK)) { |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 176 | trace_kvm_mmu_set_accessed_bit(table_gfn, index, |
| 177 | sizeof(pte)); |
Avi Kivity | bf3f8e8 | 2007-02-19 14:37:46 +0200 | [diff] [blame] | 178 | mark_page_dirty(vcpu->kvm, table_gfn); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 179 | if (FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, |
| 180 | index, pte, pte|PT_ACCESSED_MASK)) |
| 181 | goto walk; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 182 | pte |= PT_ACCESSED_MASK; |
Avi Kivity | bf3f8e8 | 2007-02-19 14:37:46 +0200 | [diff] [blame] | 183 | } |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 184 | |
Avi Kivity | bedbe4e | 2007-12-09 16:52:56 +0200 | [diff] [blame] | 185 | pte_access = pt_access & FNAME(gpte_access)(vcpu, pte); |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 186 | |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 187 | walker->ptes[walker->level - 1] = pte; |
| 188 | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 189 | if ((walker->level == PT_PAGE_TABLE_LEVEL) || |
| 190 | ((walker->level == PT_DIRECTORY_LEVEL) && |
| 191 | (pte & PT_PAGE_SIZE_MASK) && |
| 192 | (PTTYPE == 64 || is_pse(vcpu))) || |
| 193 | ((walker->level == PT_PDPE_LEVEL) && |
| 194 | (pte & PT_PAGE_SIZE_MASK) && |
| 195 | is_long_mode(vcpu))) { |
| 196 | int lvl = walker->level; |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 197 | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 198 | walker->gfn = gpte_to_gfn_lvl(pte, lvl); |
| 199 | walker->gfn += (addr & PT_LVL_OFFSET_MASK(lvl)) |
| 200 | >> PAGE_SHIFT; |
| 201 | |
| 202 | if (PTTYPE == 32 && |
| 203 | walker->level == PT_DIRECTORY_LEVEL && |
| 204 | is_cpuid_PSE36()) |
Avi Kivity | da92852 | 2007-11-21 13:54:47 +0200 | [diff] [blame] | 205 | walker->gfn += pse36_gfn_delta(pte); |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 206 | |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 207 | break; |
| 208 | } |
| 209 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 210 | pt_access = pte_access; |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 211 | --walker->level; |
| 212 | } |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 213 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 214 | if (write_fault && !is_dirty_gpte(pte)) { |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 215 | bool ret; |
| 216 | |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 217 | trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte)); |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 218 | mark_page_dirty(vcpu->kvm, table_gfn); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 219 | ret = FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte, |
| 220 | pte|PT_DIRTY_MASK); |
| 221 | if (ret) |
| 222 | goto walk; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 223 | pte |= PT_DIRTY_MASK; |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 224 | walker->ptes[walker->level - 1] = pte; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 225 | } |
| 226 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 227 | walker->pt_access = pt_access; |
| 228 | walker->pte_access = pte_access; |
| 229 | pgprintk("%s: pte %llx pte_access %x pt_access %x\n", |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 230 | __func__, (u64)pte, pt_access, pte_access); |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 231 | return 1; |
| 232 | |
| 233 | not_present: |
| 234 | walker->error_code = 0; |
| 235 | goto err; |
| 236 | |
| 237 | access_error: |
| 238 | walker->error_code = PFERR_PRESENT_MASK; |
| 239 | |
| 240 | err: |
| 241 | if (write_fault) |
| 242 | walker->error_code |= PFERR_WRITE_MASK; |
| 243 | if (user_fault) |
| 244 | walker->error_code |= PFERR_USER_MASK; |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 245 | if (fetch_fault) |
| 246 | walker->error_code |= PFERR_FETCH_MASK; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 247 | if (rsvd_fault) |
| 248 | walker->error_code |= PFERR_RSVD_MASK; |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 249 | trace_kvm_mmu_walker_error(walker->error_code); |
Shaohua Li | fe55188 | 2007-07-23 14:51:39 +0800 | [diff] [blame] | 250 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 251 | } |
| 252 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 253 | static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page, |
Dong, Eddie | 489f1d6 | 2008-01-07 11:14:20 +0200 | [diff] [blame] | 254 | u64 *spte, const void *pte) |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 255 | { |
| 256 | pt_element_t gpte; |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 257 | unsigned pte_access; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 258 | pfn_t pfn; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 259 | int level = vcpu->arch.update_pte.level; |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 260 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 261 | gpte = *(const pt_element_t *)pte; |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 262 | if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK)) { |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 263 | if (!is_present_gpte(gpte)) |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 264 | __set_spte(spte, shadow_notrap_nonpresent_pte); |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 265 | return; |
| 266 | } |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 267 | pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte); |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 268 | pte_access = page->role.access & FNAME(gpte_access)(vcpu, gpte); |
Avi Kivity | d7824ff | 2007-12-30 12:29:05 +0200 | [diff] [blame] | 269 | if (gpte_to_gfn(gpte) != vcpu->arch.update_pte.gfn) |
| 270 | return; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 271 | pfn = vcpu->arch.update_pte.pfn; |
| 272 | if (is_error_pfn(pfn)) |
Avi Kivity | d7824ff | 2007-12-30 12:29:05 +0200 | [diff] [blame] | 273 | return; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 274 | if (mmu_notifier_retry(vcpu, vcpu->arch.update_pte.mmu_seq)) |
| 275 | return; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 276 | kvm_get_pfn(pfn); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 277 | mmu_set_spte(vcpu, spte, page->role.access, pte_access, 0, 0, |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 278 | gpte & PT_DIRTY_MASK, NULL, level, |
Marcelo Tosatti | c2d0ee4 | 2009-04-05 14:54:47 -0300 | [diff] [blame] | 279 | gpte_to_gfn(gpte), pfn, true); |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 280 | } |
| 281 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 282 | /* |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 283 | * Fetch a shadow pte for a specific level in the paging hierarchy. |
| 284 | */ |
| 285 | static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 286 | struct guest_walker *gw, |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 287 | int user_fault, int write_fault, int largepage, |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 288 | int *ptwrite, pfn_t pfn) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 289 | { |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 290 | unsigned access = gw->pt_access; |
| 291 | struct kvm_mmu_page *shadow_page; |
Jaswinder Singh Rajput | bde8922 | 2009-05-20 09:59:35 +0530 | [diff] [blame] | 292 | u64 spte, *sptep = NULL; |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 293 | int direct; |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 294 | gfn_t table_gfn; |
| 295 | int r; |
| 296 | int level; |
| 297 | pt_element_t curr_pte; |
| 298 | struct kvm_shadow_walk_iterator iterator; |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 299 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 300 | if (!is_present_gpte(gw->ptes[gw->level - 1])) |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 301 | return NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 302 | |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 303 | for_each_shadow_entry(vcpu, addr, iterator) { |
| 304 | level = iterator.level; |
| 305 | sptep = iterator.sptep; |
| 306 | if (level == PT_PAGE_TABLE_LEVEL |
| 307 | || (largepage && level == PT_DIRECTORY_LEVEL)) { |
| 308 | mmu_set_spte(vcpu, sptep, access, |
| 309 | gw->pte_access & access, |
| 310 | user_fault, write_fault, |
| 311 | gw->ptes[gw->level-1] & PT_DIRTY_MASK, |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 312 | ptwrite, level, |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 313 | gw->gfn, pfn, false); |
| 314 | break; |
| 315 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 316 | |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 317 | if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) |
| 318 | continue; |
| 319 | |
| 320 | if (is_large_pte(*sptep)) { |
Joerg Roedel | c5bc224 | 2009-02-19 12:18:56 +0100 | [diff] [blame] | 321 | rmap_remove(vcpu->kvm, sptep); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 322 | __set_spte(sptep, shadow_trap_nonpresent_pte); |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 323 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | if (level == PT_DIRECTORY_LEVEL |
| 327 | && gw->level == PT_DIRECTORY_LEVEL) { |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 328 | direct = 1; |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 329 | if (!is_dirty_gpte(gw->ptes[level - 1])) |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 330 | access &= ~ACC_WRITE_MASK; |
| 331 | table_gfn = gpte_to_gfn(gw->ptes[level - 1]); |
| 332 | } else { |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 333 | direct = 0; |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 334 | table_gfn = gw->table_gfn[level - 2]; |
| 335 | } |
| 336 | shadow_page = kvm_mmu_get_page(vcpu, table_gfn, addr, level-1, |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 337 | direct, access, sptep); |
| 338 | if (!direct) { |
Avi Kivity | e7a04c9 | 2008-12-25 15:10:50 +0200 | [diff] [blame] | 339 | r = kvm_read_guest_atomic(vcpu->kvm, |
| 340 | gw->pte_gpa[level - 2], |
| 341 | &curr_pte, sizeof(curr_pte)); |
| 342 | if (r || curr_pte != gw->ptes[level - 2]) { |
| 343 | kvm_mmu_put_page(shadow_page, sptep); |
| 344 | kvm_release_pfn_clean(pfn); |
| 345 | sptep = NULL; |
| 346 | break; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | spte = __pa(shadow_page->spt) |
| 351 | | PT_PRESENT_MASK | PT_ACCESSED_MASK |
| 352 | | PT_WRITABLE_MASK | PT_USER_MASK; |
| 353 | *sptep = spte; |
| 354 | } |
| 355 | |
| 356 | return sptep; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | /* |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 360 | * Page fault handler. There are several causes for a page fault: |
| 361 | * - there is no shadow pte for the guest pte |
| 362 | * - write access through a shadow pte marked read only so that we can set |
| 363 | * the dirty bit |
| 364 | * - write access to a shadow pte marked read only so we can update the page |
| 365 | * dirty bitmap, when userspace requests it |
| 366 | * - mmio access; in this case we will never install a present shadow pte |
| 367 | * - normal guest page fault due to the guest pte marked not present, not |
| 368 | * writable, or not executable |
| 369 | * |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 370 | * Returns: 1 if we need to emulate the instruction, 0 otherwise, or |
| 371 | * a negative value on error. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 372 | */ |
| 373 | static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, |
| 374 | u32 error_code) |
| 375 | { |
| 376 | int write_fault = error_code & PFERR_WRITE_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 377 | int user_fault = error_code & PFERR_USER_MASK; |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 378 | int fetch_fault = error_code & PFERR_FETCH_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 379 | struct guest_walker walker; |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 380 | u64 *sptep; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 381 | int write_pt = 0; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 382 | int r; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 383 | pfn_t pfn; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 384 | int largepage = 0; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 385 | unsigned long mmu_seq; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 386 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 387 | pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code); |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 388 | kvm_mmu_audit(vcpu, "pre page fault"); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 389 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 390 | r = mmu_topup_memory_caches(vcpu); |
| 391 | if (r) |
| 392 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 393 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 394 | /* |
Eddie Dong | a8b876b | 2009-03-26 15:28:40 +0800 | [diff] [blame] | 395 | * Look up the guest pte for the faulting address. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 396 | */ |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 397 | r = FNAME(walk_addr)(&walker, vcpu, addr, write_fault, user_fault, |
| 398 | fetch_fault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 399 | |
| 400 | /* |
| 401 | * The page is not mapped by the guest. Let the guest handle it. |
| 402 | */ |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 403 | if (!r) { |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 404 | pgprintk("%s: guest page fault\n", __func__); |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 405 | inject_page_fault(vcpu, addr, walker.error_code); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 406 | vcpu->arch.last_pt_write_count = 0; /* reset fork detector */ |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 407 | return 0; |
| 408 | } |
| 409 | |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 410 | if (walker.level == PT_DIRECTORY_LEVEL) { |
| 411 | gfn_t large_gfn; |
Joerg Roedel | ec04b26 | 2009-06-19 15:16:23 +0200 | [diff] [blame] | 412 | large_gfn = walker.gfn & |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 413 | ~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1); |
| 414 | if (mapping_level(vcpu, large_gfn) == PT_DIRECTORY_LEVEL) { |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 415 | walker.gfn = large_gfn; |
| 416 | largepage = 1; |
| 417 | } |
| 418 | } |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 419 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 420 | smp_rmb(); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 421 | pfn = gfn_to_pfn(vcpu->kvm, walker.gfn); |
Avi Kivity | d7824ff | 2007-12-30 12:29:05 +0200 | [diff] [blame] | 422 | |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 423 | /* mmio */ |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 424 | if (is_error_pfn(pfn)) { |
Avi Kivity | ebb0e62 | 2008-05-20 16:21:58 +0300 | [diff] [blame] | 425 | pgprintk("gfn %lx is mmio\n", walker.gfn); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 426 | kvm_release_pfn_clean(pfn); |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 427 | return 1; |
| 428 | } |
| 429 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 430 | spin_lock(&vcpu->kvm->mmu_lock); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 431 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
| 432 | goto out_unlock; |
Avi Kivity | eb787d1 | 2007-12-31 15:27:49 +0200 | [diff] [blame] | 433 | kvm_mmu_free_some_pages(vcpu); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 434 | sptep = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault, |
| 435 | largepage, &write_pt, pfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 436 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 437 | pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __func__, |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 438 | sptep, *sptep, write_pt); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 439 | |
Avi Kivity | a25f7e1 | 2007-04-30 17:05:38 +0300 | [diff] [blame] | 440 | if (!write_pt) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 441 | vcpu->arch.last_pt_write_count = 0; /* reset fork detector */ |
Avi Kivity | a25f7e1 | 2007-04-30 17:05:38 +0300 | [diff] [blame] | 442 | |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 443 | ++vcpu->stat.pf_fixed; |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 444 | kvm_mmu_audit(vcpu, "post page fault (fixed)"); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 445 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 446 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 447 | return write_pt; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 448 | |
| 449 | out_unlock: |
| 450 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 451 | kvm_release_pfn_clean(pfn); |
| 452 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 453 | } |
| 454 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 455 | static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) |
| 456 | { |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 457 | struct kvm_shadow_walk_iterator iterator; |
Marcelo Tosatti | ad218f8 | 2008-12-01 22:32:05 -0200 | [diff] [blame] | 458 | pt_element_t gpte; |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 459 | gpa_t pte_gpa = -1; |
| 460 | int level; |
| 461 | u64 *sptep; |
Andrea Arcangeli | 4539b35 | 2009-03-12 18:18:43 +0100 | [diff] [blame] | 462 | int need_flush = 0; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 463 | |
Marcelo Tosatti | ad218f8 | 2008-12-01 22:32:05 -0200 | [diff] [blame] | 464 | spin_lock(&vcpu->kvm->mmu_lock); |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 465 | |
| 466 | for_each_shadow_entry(vcpu, gva, iterator) { |
| 467 | level = iterator.level; |
| 468 | sptep = iterator.sptep; |
| 469 | |
| 470 | /* FIXME: properly handle invlpg on large guest pages */ |
| 471 | if (level == PT_PAGE_TABLE_LEVEL || |
| 472 | ((level == PT_DIRECTORY_LEVEL) && is_large_pte(*sptep))) { |
| 473 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 474 | |
| 475 | pte_gpa = (sp->gfn << PAGE_SHIFT); |
| 476 | pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t); |
| 477 | |
| 478 | if (is_shadow_present_pte(*sptep)) { |
| 479 | rmap_remove(vcpu->kvm, sptep); |
| 480 | if (is_large_pte(*sptep)) |
| 481 | --vcpu->kvm->stat.lpages; |
Andrea Arcangeli | 4539b35 | 2009-03-12 18:18:43 +0100 | [diff] [blame] | 482 | need_flush = 1; |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 483 | } |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 484 | __set_spte(sptep, shadow_trap_nonpresent_pte); |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 485 | break; |
| 486 | } |
| 487 | |
| 488 | if (!is_shadow_present_pte(*sptep)) |
| 489 | break; |
| 490 | } |
| 491 | |
Andrea Arcangeli | 4539b35 | 2009-03-12 18:18:43 +0100 | [diff] [blame] | 492 | if (need_flush) |
| 493 | kvm_flush_remote_tlbs(vcpu->kvm); |
Marcelo Tosatti | ad218f8 | 2008-12-01 22:32:05 -0200 | [diff] [blame] | 494 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 495 | |
| 496 | if (pte_gpa == -1) |
Marcelo Tosatti | ad218f8 | 2008-12-01 22:32:05 -0200 | [diff] [blame] | 497 | return; |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 498 | if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte, |
Marcelo Tosatti | ad218f8 | 2008-12-01 22:32:05 -0200 | [diff] [blame] | 499 | sizeof(pt_element_t))) |
| 500 | return; |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 501 | if (is_present_gpte(gpte) && (gpte & PT_ACCESSED_MASK)) { |
Marcelo Tosatti | ad218f8 | 2008-12-01 22:32:05 -0200 | [diff] [blame] | 502 | if (mmu_topup_memory_caches(vcpu)) |
| 503 | return; |
Avi Kivity | a461930 | 2008-12-25 15:19:00 +0200 | [diff] [blame] | 504 | kvm_mmu_pte_write(vcpu, pte_gpa, (const u8 *)&gpte, |
Marcelo Tosatti | ad218f8 | 2008-12-01 22:32:05 -0200 | [diff] [blame] | 505 | sizeof(pt_element_t), 0); |
| 506 | } |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 507 | } |
| 508 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 509 | static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) |
| 510 | { |
| 511 | struct guest_walker walker; |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 512 | gpa_t gpa = UNMAPPED_GVA; |
| 513 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 514 | |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 515 | r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 516 | |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 517 | if (r) { |
Avi Kivity | 1755fbc | 2007-11-21 14:44:45 +0200 | [diff] [blame] | 518 | gpa = gfn_to_gpa(walker.gfn); |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 519 | gpa |= vaddr & ~PAGE_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | return gpa; |
| 523 | } |
| 524 | |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 525 | static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu, |
| 526 | struct kvm_mmu_page *sp) |
| 527 | { |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 528 | int i, j, offset, r; |
| 529 | pt_element_t pt[256 / sizeof(pt_element_t)]; |
| 530 | gpa_t pte_gpa; |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 531 | |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 532 | if (sp->role.direct |
Avi Kivity | e5a4c8c | 2007-11-20 21:39:54 +0200 | [diff] [blame] | 533 | || (PTTYPE == 32 && sp->role.level > PT_PAGE_TABLE_LEVEL)) { |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 534 | nonpaging_prefetch_page(vcpu, sp); |
| 535 | return; |
| 536 | } |
| 537 | |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 538 | pte_gpa = gfn_to_gpa(sp->gfn); |
| 539 | if (PTTYPE == 32) { |
Avi Kivity | e5a4c8c | 2007-11-20 21:39:54 +0200 | [diff] [blame] | 540 | offset = sp->role.quadrant << PT64_LEVEL_BITS; |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 541 | pte_gpa += offset * sizeof(pt_element_t); |
| 542 | } |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 543 | |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 544 | for (i = 0; i < PT64_ENT_PER_PAGE; i += ARRAY_SIZE(pt)) { |
| 545 | r = kvm_read_guest_atomic(vcpu->kvm, pte_gpa, pt, sizeof pt); |
| 546 | pte_gpa += ARRAY_SIZE(pt) * sizeof(pt_element_t); |
| 547 | for (j = 0; j < ARRAY_SIZE(pt); ++j) |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 548 | if (r || is_present_gpte(pt[j])) |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 549 | sp->spt[i+j] = shadow_trap_nonpresent_pte; |
| 550 | else |
| 551 | sp->spt[i+j] = shadow_notrap_nonpresent_pte; |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 552 | } |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 553 | } |
| 554 | |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 555 | /* |
| 556 | * Using the cached information from sp->gfns is safe because: |
| 557 | * - The spte has a reference to the struct page, so the pfn for a given gfn |
| 558 | * can't change unless all sptes pointing to it are nuked first. |
| 559 | * - Alias changes zap the entire shadow cache. |
| 560 | */ |
| 561 | static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) |
| 562 | { |
| 563 | int i, offset, nr_present; |
| 564 | |
| 565 | offset = nr_present = 0; |
| 566 | |
| 567 | if (PTTYPE == 32) |
| 568 | offset = sp->role.quadrant << PT64_LEVEL_BITS; |
| 569 | |
| 570 | for (i = 0; i < PT64_ENT_PER_PAGE; i++) { |
| 571 | unsigned pte_access; |
| 572 | pt_element_t gpte; |
| 573 | gpa_t pte_gpa; |
| 574 | gfn_t gfn = sp->gfns[i]; |
| 575 | |
| 576 | if (!is_shadow_present_pte(sp->spt[i])) |
| 577 | continue; |
| 578 | |
| 579 | pte_gpa = gfn_to_gpa(sp->gfn); |
| 580 | pte_gpa += (i+offset) * sizeof(pt_element_t); |
| 581 | |
| 582 | if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte, |
| 583 | sizeof(pt_element_t))) |
| 584 | return -EINVAL; |
| 585 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 586 | if (gpte_to_gfn(gpte) != gfn || !is_present_gpte(gpte) || |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 587 | !(gpte & PT_ACCESSED_MASK)) { |
| 588 | u64 nonpresent; |
| 589 | |
| 590 | rmap_remove(vcpu->kvm, &sp->spt[i]); |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 591 | if (is_present_gpte(gpte)) |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 592 | nonpresent = shadow_trap_nonpresent_pte; |
| 593 | else |
| 594 | nonpresent = shadow_notrap_nonpresent_pte; |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 595 | __set_spte(&sp->spt[i], nonpresent); |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 596 | continue; |
| 597 | } |
| 598 | |
| 599 | nr_present++; |
| 600 | pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte); |
| 601 | set_spte(vcpu, &sp->spt[i], pte_access, 0, 0, |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 602 | is_dirty_gpte(gpte), 0, gfn, |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 603 | spte_to_pfn(sp->spt[i]), true, false); |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | return !nr_present; |
| 607 | } |
| 608 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 609 | #undef pt_element_t |
| 610 | #undef guest_walker |
| 611 | #undef FNAME |
| 612 | #undef PT_BASE_ADDR_MASK |
| 613 | #undef PT_INDEX |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 614 | #undef PT_LEVEL_MASK |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 615 | #undef PT_LVL_ADDR_MASK |
| 616 | #undef PT_LVL_OFFSET_MASK |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 617 | #undef PT_LEVEL_BITS |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 618 | #undef PT_MAX_FULL_LEVELS |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 619 | #undef gpte_to_gfn |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame^] | 620 | #undef gpte_to_gfn_lvl |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 621 | #undef CMPXCHG |